How soon do you start to get pregnancy symptoms?

My partner and I haven't been using a lot of protection and since Dec 19 we had unprotected intercourse I started feeling strange. I am super tired all the time and super hungry too, we want to think it could be a side effect of the morning after pill (we took it about a month ago after we kinda freaked out) and in my experience it's too soon to show symptoms.

I know every woman is different but I would love to know your opinions.

PS. My period isn't late (yet), its due in 2 or 3 days.